implemented cheetah#1

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JasmineDeng wants to merge 11 commits intopulkitag:masterfrom

JasmineDeng:master

Commits on Mar 21, 2017

implemented cheetah
JasmineDeng
committed

Commits on Mar 24, 2017

Commits on Mar 25, 2017

Commits on Mar 26, 2017

initialized cheetah correctly, modified README
JasmineDeng
committed

Commits on Apr 8, 2017

working stacker environment
JasmineDeng
committed

Commits on Apr 18, 2017

two blocks in reacher_agent now
JasmineDeng
committed

Commits on Apr 22, 2017